im 26 i recently found out i have seboorheic dermatitis. after lookin at the symptoms i have been having it for probly a while becuase i always had bad dandruff when i was growin up. i been having this mark on my chin for at least 2-3 years thats been dry and flaky. i noticed it everytime i cut my beard hair. well about a year ago i got it on my cheek and then on my mustache and in nasal folds and between my eyebrows. once i figured out what it was i was depressed i didnt eat, i begin to feel fatigue and was constipated becuase i read hiv is a main cuase. i havent had any fevers or wieght loss. or diahrea. but any ways i need to know the chances this is hiv and how long usually you would have to have it to see the symtoms of sebborheic dermatitis