I have done a lot of erotic massages. A couple of times masseuse fingered myanus. Hand jobs and rub n tug were there. Last week itching and black spots developed around my penis. Now there is no itching but irritation is there. I checked the blood and urine but no problems. I consulted the doctor and allergy has been diagnosed. Should I test for STDs ? I'm really worried. I always think too much.