Dermatology Questions? Ask an Online Dermatologist.
Hi and thanks for the query,
First of all you should get STD screening and if there is a non healing ulcer or lesion on your penis you should get it evaluated by genitourinary specialist so that anything serious can be ruled out and exact diagnosis can be found and treatment can be given accordingly. You may need a swab test for this.
You can take tylenol 2 tablets for your knee pain and apply ibuprofen gel and crepe bandage.
Let me know if you have further questions.
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Wish you good health