Hai, It may be a
Balanoposthitis (Inflammation of foreskin and
glans penis) or it may be due to mild
injury during sex or due to
drug allergy. Balanoposthitis may be due to various reasons like yeast, irritation, allergy etc. It may not be due to major STD, but may be a marker. So consult your nearby dermato venereologist and he/she will guide you further to treat the same. Get well soon. Dr SM