hello i am an 18 yr old white gay circumcized male. over the past 2-3 months i have been having an uncomftorable and inconsistant burning sensation on/in my penis. it bothers me about 90 percent of the time and is the worse/gets worse with any kind of erection and especially masturbation or friction.. i cannot pinpoint an exact location but it is worse on the underside of the middle of the shaft. there are no bumps/blisters/puss/crust/bleeding, but i think i see some shiny lines running vertically along the under shaft when i pull at the skin yet i have had 2 doctors and the nurse at the health department who do not seem to think they are abnormal. i have been slightly sexually active but have always used a condom for insertive sex (about 5 times) with my one regular partner who denies any std problems and has been tested. and i have recieved unprotected oral sex from him as well as one other guy (also short time frottage with the penis and thighs) and girl since december who both deny std problems with tests etc. i have been tested for hiv, syphilis, gonorrea, chlamidia, and had a swab done on my penis for herpes.. all negative. i had a negative urine sample. i tried doxycycline (which i took for a year + earlier so maybe theres some resistance). i tried a year old nystatin anti-fungal ointment for a couple days, not much help. tried neosporin a little. nothing. tried hydrocortisone (cortaid) but it kinda burned so i stoped after a day... maybe i didnt use these products long enough or something... i have just been having this annoying sunburn/heat feeling constantly that gets alot worse after any friction. i have also noticed more pre *** and post *** as far as masturbation but maybe thats normal. and my penis feels alot more sore than it ever has before afterwards for about a day. maybe some slight burning while before and after urination but nothing too bad.. maybe its all in my head but idk. i've been to multiple doctors and plan to see a urologist or dermatoligist if it consists bc its making me very upset. any help would be great. thanks.