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Please do not go to Finasteride straight away. First, the cause and the pattern of your hair loss have to be assessed.
It could vary from seborrheic dermatitis to androgenic alopecia to any other skin disorders too. Then, treatment can be planned.
Have a consultation with a dermatologist for physical evaluation and get your problem assessed.
Hydrocele is not related to testosterone. It is just a fluid collection in the sac. So, please do not get confused.
For further information consult a dermatologist online --> https://www.icliniq.com/ask-a-doctor-online/dermatologist