1. It may be a normal physiological phenomenon: The yellow secretion in front of male underwear may be normal physiological fluids such as prostate fluid, semen residue, or urethral gland secretion, which may appear yellow after drying.
2. Urinary tract infection or inflammation: If yellow discharge is accompanied by symptoms such as odor, frequent urination, urgency, and pain during urination, it may be a manifestation of inflammatory diseases such as urinary tract infection or prostatitis.
3. Personal hygiene habits: Poor personal hygiene habits, such as not changing underwear frequently or not cleaning thoroughly, may also lead to the accumulation and discoloration of secretions on underwear. It is recommended to maintain good personal hygiene habits and regularly change and clean underwear.