A “bleach” spot on your underwear—where the fabric appears lighter or discolored—can be caused by a few things:
- Vaginal Discharge – Normal vaginal discharge is slightly acidic (pH 3.5–4.5), and over time, it can cause fabric discoloration, especially in darker underwear. This is completely natural and common.
- Detergents or Bleach Residue – If you’ve washed your underwear with strong detergents, bleach, or stain removers, leftover residue might cause spots.
- Sweat or Body Oils – Sweat, combined with natural body oils and bacteria, can sometimes cause fabric to fade or change color.
- Chemical Exposure – If you’ve used creams, lotions, or hygiene products containing peroxide (like acne treatments or vaginal washes), they can have a bleaching effect.
If the discoloration is due to normal discharge, it’s harmless. Switching to cotton underwear and washing with gentle detergent can help minimize it.