Masturbated vigorously before a month and my penile head circumference is purple red colored also sometimes itches. Can I apply aloe plant gel on it.?

I wouldn't. Ghat skin is quite sensitive and absorptive. It is hard to predict what sort of reaction you would have to the strange chemicals contained in that gel. Find a mild steroid cream like 1/2% hydrocortizone and use it no more than twice a day in small amounts. It should resolve the itching & irritation involved.