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Redness underneath the glans (the head of the penis) is a common symptom often associated with balanitis, which is the inflammation of the glans. If you are uncircumcised, it may also involve inflammation of the foreskin (balanoposthitis).
While it is usually not serious and often resolves with improved hygiene or simple treatment, it is important to have a doctor evaluate it to determine the exact cause and get the correct treatment.
Potential Causes
Poor Hygiene or Over-cleaning: A build-up of smegma (a natural, white, oily substance) under the foreskin can cause irritation. Conversely, washing with harsh soaps, shower gels, or perfumed products can also cause irritation and inflammation.
Yeast Infection (Thrush): An overgrowth of Candida fungus is a common cause, often characterized by red, itchy spots, sometimes with a white, cheesy discharge.
Bacterial Infection: Bacteria can build up under the foreskin, leading to redness and pain.
Skin Conditions: Eczema, psoriasis, or lichen sclerosus can cause red, itchy, or flaky patches.
Allergic Reactions (Contact Dermatitis): Reactions to soaps, laundry detergents, lubricants, or latex condoms can cause redness.
Underlying Medical Conditions: Diabetes can increase the risk of balanitis due to higher glucose levels in the urine, which encourages bacterial/fungal growth.