Rated 5.0/5 based on 20 votes

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

Share
1

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

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

See 1 more doctor answer
Dr. Jennifer Haley
Board Certified, Dermatology
17 years in practice
243K people helped
Get help from a real doctor now
Continue
Dr. Mark Diamond
2,231 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


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?

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

Dr. Jennifer Haley
Board Certified, Dermatology
17 years in practice
243K people helped
Get help from a real doctor now
Continue
3

3
Treating a Fever (Checklist)

Don't panic! Most fever is uncomfortable, but harmless.
Once
Take the appropriate dose of acetaminophen or ibuprofen
Once
Try cool compresses -- they may be soothing
Once
See doctor if your fever is higher than 102F for more than 2 days
Once
4

4
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?

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

5

5
My 4 year old daughter started antibiotics s thursday afternoon for scarlet fever. When will she not be contagious? Tounge blisters go away?

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

See 1 more doctor answer
6

6
Managing Hay Fever (Checklist)

Avoid heavy pollen areas
Once
Use air conditioners during pollen season
once
If necessary, use a non-sedating antihistamine
Once
Board Certified, Dermatology
17 years in practice
243K people helped
Get help from a specialist now
Continue
7

7
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?

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

See 1 more doctor answer
8

8
How long is a fever present  before blisters appear with hand, foot, mouth disease?

How long is a fever present  before blisters appear with hand, foot, mouth disease?

Hand, Foot & Mouth: Hand, foot, and mouth disease usually starts with a fever, poor appetite, a vague feeling of being unwell (malaise), and sore throat. One or 2 days after fever starts, painful sores usually develop in the mouth (herpangina). They begin as small red spots that blister and that often become ulcers. The sores are often in the back of the mouth. A skin rash develops over 1 to 2 days. ...Read more

See 1 more doctor answer
9

9
How long after fever breaks am I still contagious? (Should I go on car ride with friends if for sure fever free for 12 hours)

How long after fever breaks am I still contagious? (Should I go on car ride with friends if for sure fever free for 12 hours)

Generally, 24 hours: The period of contagiousness is variable depending on what sort of infection you have, but in general it is recommended to stay home from school, work and daycare until you are fever free for 24 hours without acetaminophen or ibuprofen. ...Read more

10

10
My son started having symptoms of croup 48 hours ago. He was diagnosed by a Dr. today. His fever is gone now. How much longer will he be contagious?

My son started having symptoms of croup 48 hours ago. He was diagnosed by a Dr. today.  His fever is gone now. How much longer will he be contagious?

Shedding for awhile: Viral shedding, or period of contagiousness, for these types of viruses can last weeks, and are shed through the upper respiratory structures. However, since most of the shedding occurs during the time that the person is feeling very sick and febrile, let your son's behavior and overall appearance be your guide. Most daycares and schools require a 24 hour fever free period (without medications). ...Read more

See 1 more doctor answer
Dr. David Schleimer
1,441 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


Contagious (Definition)

One is able to transmit an infection to another by ...Read more


Get more personalized answers directly from real doctors!

Get help from a real doctor now
Dr. Jennifer Haley
Board Certified, Dermatology
17 years in practice
243K people helped
Continue
65,000 doctors available
About our doctors
  • HealthTap gives you access to top U.S. certified doctors
  • Our doctors are checked, verified and board certified
  • Get personalized help and answers directly from the doctor
Get free help now
Find us on Facebook