Hello, im a 15 year old boy and i have these lines that are growing on my inner thighs near my testes and its very painful. It looks like stretch marks that formed into little bumps that seems to spread day by day and gets larger to. When i move around and those bumps rub into clothing or my thighs it would hurt and would be irritating. If i dont move my legs for a couple of hours the pain would go away and i can freely walk Without having to worry about the pain, but then after a while of moving around the pain would come back and would start to be irritating cause of underwear or thighs rubbing against it.
Hi, I value your concern regarding the symptoms. I have gone through your symptoms, and in my opinion these are nothing but lines due to your growth spurt phase, I would advise you to wear loose clothes, keep your skin clean and Chat Doctor.  These will go away with time. Enjoy you are growing and healthy Hope this answers your question. If you have additional questions or follow-up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. Special note-Any medication prescribed needs to be taken after consultation with your personal doctor only.