Hi there young man... Masturbation at night has no specific relationship to the dryness unless you don't wash post masturbating or if you are using some soap 🧼 that is causing an allergic reaction and subsequent dryness. Coconut oil appears to have helped you. However, if the dryness is linked to some allergy or infection (eg Hsv) then that will have to be addressed. Fungal infections don't usually present this way. Have you been sexually active aside from the masturbation? A more detailed history and a personal consultation may be in order.

Consult online for proper evaluation and treatment

Please consult online to get the know the exact cause and treatment

Kindly consult online for proper treatment and guidance. Specific medication will improve condition.

No need to worry.specific treatment is available.it depends on severity of the disease . Complete medical history is required.. Pls do online consultation with Dermatologist for detailed prescription & guidance.

Kindly take online consultation for detailed history so that proper medication can be disposed.

Kindly consult online for proper evaluation and management?

If its itchy as well , it could be fungal infection. Other possibilities are allergic reaction to any lube you may be using. not washing after masturbation can cause fungal infection . Maintain proper hygiene.