Answer:
(Fatwa: 199/148/B=1433)
Madhi (penile secretion) is also impure. If it gets onto the underwear it is necessary to wash the underwear and penis. Salah shall not be valid without washing it. Secreting madhi is also a kind of disease. You should consult any expert physician and get it treated.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
