Itching and blackness in your thighs are something that many people are mentally troubled by. The main reason for this is that fungal infections spread quickly in a humid environment. The main causes are:
Jock Itch: This is an infection caused by the fungus ‘Tinea cruris’. It spreads due to wearing wet clothes for a long time and due to sweat retention. Red bumps and severe itching are the main symptoms.
Excessive sweating and moisture: Since the thighs are always closed, sweat does not dry quickly. This moisture creates an ideal environment for bacteria and fungi to grow. Wearing clothes that do not have proper ventilation increases this problem.
Chafing: Constant rubbing between the thighs while walking or running can damage the protective layer of the skin. This causes darkening of the skin, itching, and stretching. This problem is more common in people who are obese.
Hormonal changes and diabetes: People with high blood sugar levels are more likely to develop fungal infections. Also, people with insulin resistance are more likely to develop a condition called Acanthosis Nigricans, which causes darkening and thickening of the skin on the thighs.
Allergies and chemicals: Harsh soaps, detergents used to wash underwear, or perfumes used on the body can cause allergies on the sensitive skin of the thighs. This can lead to itching and later darkening of the area.