Every spring, I get a rash on the backs of my knees which is hot, bumpy, its red and very itchy. There is no over the counter medicine that has ever helped me, so for years, I just suffer through the 2-3 months that I have it. Sometimes the area gets dry. I have been having this happen since I was 6 years old, and I am 34 now. If I was never able to count on anything else, I can always expect this rash to come back like the terminator.
Hi Dear, Understanding your concern. As per your query you have symptoms of rash on knees which seems to be due to allergic reaction/contact dermatitis as you get these symptoms on exposure to allergen. Need not worry. I would suggest you to keep this area clean and Chat Doctor.  You should avoid touching or pricking rashes. You should consult dermatologist for proper examination and go for blood test, allergic patch test and start treatment accordingly. Doctor may prescribe immunosuppressants, along with benzoyl peroxide ointment. Hope your concern has been resolved. Best Wishes,