Can the bleeding blister in my genital area be due to an STD?

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I understand your concern. My diagnosis is external piles (external hemorrhoids). Diet is the culprit, and I suggest you consult your specialist doctor, discuss with them and take the medicines with their consent. Diet should not have spices, fried food, junk food, fast food, or outside food. Have buttermilk, curd, and plenty of salad, at least two times a day so that bolus is formed soft. Treatment involves: If there is constipation or hard stool, add liquid Cremafine (Magnesium Hydroxide), three teaspoons at night, till the stool softens. If there is pain, take Signoflam (Aceclofenac) three times a day after food for five days. If there is a tag outside, take a tablet Hilo (Commiphora molmol, Oleoresin, Gardenia gummifera, Gum resin, Tagetes erecta, Mesua ferrea) twice a day after eating meals for 15 days. Oxeyrute (Calcium obesilate and Troxerutin) cream is applied locally with the index finger. First, apply on the butthole, gently push the cream inside and rotate the finger. This should be done two times a day for three weeks for complete healing.