What causes fever blisters and swollen lymph nodes?

Virus. Fever blisters or 'cold sores' are from a herpes simpex virus. This can cause regional adenopathy. There is medication available to help.
Herpes. See a dermatologist. Common "fever blisters" are herpes simplex type 1. At the very first tingling (prodrome) you can take a prescription pill: Acyclovir or valacyclovir which will reduce the symptoms & allow faster healing. Use sunscreen stick to protect from sun as this is the most common trigger. Creams for this, both otc & rx, are of little benefit. Once you have a blister for a day it makes n.

Related Questions

I get fever blisters from stress. I get swollen glands along my jaw but I noticed I have swollen glands in my groin, too. Virus? I'm just tired but ok

Exactly right. Fever blisters are outbreaks of herpes virus (usually HSV-1) that will attack at your expense when you are run-down, stressed out. Thus, the best thing to do is sleep well, eat properly, avoid toxins (smoke/alcohol) and avoid STRESS. Easy to say, but hard to do... Certainly the lymph nodes in the region of the herpes outbreak would 'react' and become larger. With the groin, that could be different. Read more...
Probably. But if these symptoms last more than 10 days or get worse, you will need to see your doctor. Read more...

Can cat scratch fever cause swollen lymph nodes with no other symptoms? Around barn cats at times and have a reg. Cat in the house.

That is most common. Single, large, mildly painful lymphnode is the most common presentation after the initial several small papules(zit-like) at the site-of-infection/innoculation, usually 1-3 wks later. Most of the cases resolve on their own without treatment in 2-12 month, but some have fever/fatigue, headache, anorexia, joint pain, and other rare/severe symptoms. Consult to make sure this is catscratch. Good luck. Read more...

Red bumps, fever, swollen lymph nodes?

Not enough info. Where, when, how long? Submit more information to get a sensible answer. Good luck. Read more...

On off fever for 3 weeks. I got a cbc without differential & physical exam for swollen lymph nodes etc. Both normal. Do I need to worry about leukemia?

No. What did your doctor tell you about your swollen lymph nodes? You may watch and wait. You may feel the nodes every couple of weeks, if any of the lymph glands doubles in size, becomes painful, ulcerates, or other nodes become enlarged, or you develop fever, or lose weight, you should see a doctor.
Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex, if you have sex. Read more...