My testicle skin got red-colored patches. Previously my testicle skin was itching a lot and touching it was a little painful. What is happening to me?

Pruritus genitalia. This is one of the neurodermatoses often triggered by stress. The more you scratch, the more you itch!. Try applying a cool compress wet to dry for 3-4 minutes and then apply OTC hydrocortisone 1% ointment. If this stil is not helping, you need to consult a dernatologist for stronger topical steroids and possibly oral antihistamines.