I am a 22-year-old male. My weight is 180 lbs and my height is 5'10". I was prescribed a generic brand of Adderall 20 mg about a year ago. It truly has improved my lifestyle. Up until about two months ago everything was fine. I noticed that the left side of my neck became red randomly. I would describe it as looking more like a heat rash that starts around my collar, goes up only on the left side of my neck. It extends to my left ear and sometimes I get some redness on my left cheekbone. It does not itch or bother me in any way, but it is very noticeable sometimes. I have not been able to find any other factor that could be causing this. I have tried not eating particular foods, changing my laundry detergent, etc. My older brother and I both get a redness in our face when we play sports and this has happened every since I can remember. I do occasionally smoke cigarettes and have tried different brands to see if that may have a factor, but nothing. I have been to my local doctor and they have said that it is probably allergies, but I just do not agree. I am not allergic to anything, but I have not got around to getting an allergy test since the redness appeared. I am very concerned about this and more embarrassed. Thank you for any advice.