Rated 5.0/5 based on 18 votes

Top
10
Doctor insights on: How Long Is A Fever Blister Contagious

Share
Dr. John Munshower
Board Certified, Family Medicine
25 years in practice
93M people helped
1

1
My 9 year old keeps getting fever blisters. Why? Are they contagious?

Dr. John Munshower
Board Certified, Family Medicine
25 years in practice
93M people helped
My 9 year old keeps getting fever blisters. Why? Are they contagious?

Yes: Fever blisters/cold sores are most commonly caused by the hsv1 virus which is very common and found in most people. The virus is contagious and some people are simply more prone to getting the "fever blisters" than others. There are some meds, including topicals that help decrease the duration of the symptoms and provide some relief. Best wishes. ...Read more

Get help from a doctor now ›

85,000 doctors available

Get Treatment for Your Skin Condition Now!

Skin conditions result from a number of factors and can reduce your quality of life. It's important to have a doctor evaluate your condition to ensure it is not something more serious than a minor irritation. At HealthTap, you can connect to a doctor in minutes via chat or video to get peace of mind!

Doctors are standing by 24/7 for advice, treatment or prescriptions. Get help today!

85,000 doctors available

Get Treatment for Your Skin Condition Now!

Skin conditions result from a number of factors and can reduce your quality of life. It's important to have a doctor evaluate your condition to ensure it is not something more serious than a minor irritation. At HealthTap, you can connect to a doctor in minutes via chat or video to get peace of mind!

Doctors are standing by 24/7 for advice, treatment or prescriptions. Get help today!
Dr. Vikram Patel
Board Certified
32 years in practice
853K people helped
Get help from a real doctor now
Dr. Vikram Patel
Board Certified
32 years in practice
853K people helped
Continue
Dr. Mark Diamond
2,228 doctors shared insights

Fever (Definition)

Fever is the temporary increase in the body's temperature in response to some disease or illness. A child has a fever when the temperature is at or above one of ...Read more


Dr. James Ferguson
Board Certified, Pediatrics
41 years in practice
145M people helped
2

2
2 yr old has HFMD. Started fri/sat. When will he stop being contagious? Fever gone, still has blisters on Wed. Ok for family event Saturday?

Dr. James Ferguson
Board Certified, Pediatrics
41 years in practice
145M people helped

Hard to say: At 2, their general activities include mouthing toys and fingers and spreading saliva around their environment. Since HFV viruses can shed in the respiratory tract and saliva for 1-2 weeks after initial symptoms, so how and when they stop spreading the germ is difficult to say.It can persist for 4-6 weeks in the stool. ...Read more

Get help from a doctor now ›
Dr. Vikram Patel
Board Certified
32 years in practice
853K people helped
Get help from a real doctor now
Dr. Vikram Patel
Board Certified
32 years in practice
853K people helped
Continue
Dr. Christine Hom
Board Certified, Pediatrics
25 years in practice
237K people helped
3

3
My bestfriend's bf gets lip blisters ever since he was a kid. He got them last in 2012 due to sun exposure, this time after a fever. Is it contagious?

Dr. Christine Hom
Board Certified, Pediatrics
25 years in practice
237K people helped
My bestfriend's bf gets lip blisters ever since he was a kid. He got them last in 2012 due to sun exposure, this time after a fever. Is it contagious?

Cold blisters: Herpesviruses at the edge of the lip are contagious, so much so that most people your age are already infected. Stress, illness and sun exposure can cause a new breakout. ...Read more

Get help from a doctor now ›
Dr. Joel Piehl
Board Certified, Periodontics
46 years in practice
187K people helped
4

4
I got a fever blister inside my mouth 10 days ago. It has since gone down & healed, but i was wondering if i'm contagious?

Dr. Joel Piehl
Board Certified, Periodontics
46 years in practice
187K people helped
I got a fever blister inside my mouth 10 days ago. It has since gone down & healed, but i was wondering if i'm contagious?

Not contagious: If it is completely healed you need not worry. ...Read more

Get help from a doctor now ›
Dr. Vikram Patel
Board Certified
32 years in practice
853K people helped
Get help from a specialist now
Continue
Dr. Victoria Cirillo-Hyland
Board Certified, Dermatology
32 years in practice
82K people helped
5

5
7 hrs after fainting and vomiting, fever blisters appered on my chin. Can this still be related to my episode? Or herpes? And is this contagious?

Dr. Victoria Cirillo-Hyland
Board Certified, Dermatology
32 years in practice
82K people helped

Stress: "fever blisters" are caused by herpes simplex and are contagious. We are all exposed to herpes simplex at a young age. Some people continue to have outbreaks during stressful times and with exposure to the sun. Others may never have repeated outbreaks. Your body was stressed due to the vomiting and fainting episode you had. Thus, the outbreak of herpes simplex. Valtrex will treat this. ...Read more

Get help from a doctor now ›
Dr. Joseph Bouvier
Board Certified, Pediatrics
20 years in practice
4M people helped
6

6
If a fever blister on the roof of the mouth is gone, but the area is still tender is it still contagious?

Dr. Joseph Bouvier
Board Certified, Pediatrics
20 years in practice
4M people helped
If a fever blister on the roof of the mouth is gone, but the area is still tender is it still contagious?

Probably not: If no blister or vesicle is there, you are probably feeling the after effects of the lesion which should fade with time. ...Read more

Get help from a doctor now ›
Dr. Sandra Eleczko
Board Certified, Dentistry
31 years in practice
6M people helped
7

7
My 4 year old daughter started antibiotics s thursday afternoon for scarlet fever. When will she not be contagious? Tounge blisters go away?

Dr. Sandra Eleczko
Board Certified, Dentistry
31 years in practice
6M people helped
My 4 year old daughter started antibiotics s thursday afternoon for scarlet fever.  When will she not be contagious? Tounge blisters go away?

24-48 hours: Typically it takes 24 hours until she is. Or contagious. She will still have symptoms. They will take longer to resolve. ...Read more

Get help from a doctor now ›
Dr. Ankush Bansal
Board Certified, Internal Medicine
12 years in practice
34M people helped
8

8
My mother in law just had some dental work done and now she has a fever blister on her lip. Does this mean she has hsv-1 and is contagious?

Dr. Ankush Bansal
Board Certified, Internal Medicine
12 years in practice
34M people helped

Perhaps: If she had a previous history of hsv, then the stress of dental work can lead to a localized breakout. If it is hsv, then yes, she is contagious. Anytime there are active hsv lesions - oral or genital - then one is contagious. It's the fluid within the blister that contains the virus. ...Read more

Get help from a doctor now ›
Dr. John Munshower
Board Certified, Family Medicine
25 years in practice
93M people helped
9

9
If a child has Hand, Foot, Mouth Disease and has blisters that are still erupting, but no fever. Is he or she contagious or no?

Dr. John Munshower
Board Certified, Family Medicine
25 years in practice
93M people helped
If a child has Hand, Foot, Mouth Disease and has blisters that are still erupting, but no fever. Is he or she contagious or no?

Hand/foot/mouth: Generally, a person with hand, foot, and mouth disease is most contagious during the first week of illness. People can sometimes be contagious for days or weeks after symptoms go away. This is why people should always try to maintain good hygiene (e.g. handwashing) so they can minimize their chance of spreading or getting infections. ...Read more

Get help from a doctor now ›
Dr. James Ferguson
Board Certified, Pediatrics
41 years in practice
145M people helped
10

10
How long is a fever contagious? I had 102 last night and now I have 99. I work with children...Is taking a rest day a good idea

Dr. James Ferguson
Board Certified, Pediatrics
41 years in practice
145M people helped
How long is a fever contagious? I had 102 last night and now I have 99. I work with children...Is taking a rest day a good idea

Yes: Most viral illnesses are likely spreading live virus in the saliva and respiratory secretions for up to 24 hours after the fever stops. Good hand washing and wearing a mask can contain most of the spread, but a 24 hour period fever free is considered the best way to stop spread. If the issue were something like strep throat, treatment would need to be underway for 24 hrs before it was contained. ...Read more

Get help from a doctor now ›
Dr. David Schleimer
1,602 doctors shared insights

Blistering (Definition)

Blistering is a bubble of skin filled with fluid. They can occur to excessive rubbing (as with a new pair of ...Read more


Get more personalized answers directly from real doctors!

Get help from a real doctor now
Dr. Vikram Patel
Board Certified,
32 years in practice
853K people helped
Continue
85,000 doctors available
Find us on Facebook