“A hard lump under the crotch” refers to a hard lump growing on the pubic area, which may be related to conditions such as condyloma acuminatum, folliculitis and boils. 1. Condyloma acuminatum: If the bumps are papillary or cauliflower-shaped, without conscious symptoms such as itching and pain, and the color is close to skin color, they may be condyloma acuminatum caused by HPV infection. 2. Folliculitis or boils: if the hard bumps are red, swollen and raised bumps with white or yellow pus spots at the top of the bumps, or if they are red and swollen with obvious pain or tenderness, they may be folliculitis or boils caused by Staphylococcus aureus and other infections. A hard lump under the crotch may also have other causes, it is recommended that the patient go to a regular hospital in a timely manner by a professional doctor for standardized diagnosis and treatment.