Itching in inside walls of private part.

It's been a 20+ days I am getting too much itching sensation in my private part at testicles n rib or top of the penis. I thought it's a fungal infection so tried to use itchgaurd, friklyheat powder but no difference observed. When I tried to look in my private part very thoroughly I found small tiny set of 4-5 water filled bumps(it's very minute in size , hardly less than a suji rava size) in inner Walls of the penis outer skin and over the testicles. It's itching very badly some times, but it's not full day. I tried to search some blogs and found that it may be kind of "Sebaceous hyperplasia on the internal lamina of the prepuce." Need some ointment suggested for this.. I m worried to go for any dermatologist to show this. One more thing it was there in last month as well but it automatically went out and in next 15days of gap it rearrived.