Thanks for query on HCM.
Bump on the penis can have several causes. Many penis lumps are harmless,non symptomatic and need no treatment.
It might be due to bad hygiene.
Just take proper local care.Wash that are with warm water,try to retract your foreskin while pouring warm water.
Otherwise it might be due to bacterial/
fungal infection,
hair root infection,genital wart/viral infection.
Apply
local antibiotic cream to prevent infection and promote healing under guidance of your doctor.
Avoid tight under garment,avoid unprotected sex.
Go for investigations like cbc,urine,fbs,ppbs,
std profile,hsv test to confirm any underlying condition.
Otherwise get examined by doctor to confirm the proper diagnosis and medical management.