What causes hard, ingrown splinters on both sides of the fingernails?

Possible causes of hard hangnails on the sides of fingernails include: 1. Dry skin: Prolonged exposure to dry environments or improper skin care may lead to dehydration of the skin, resulting in hard hangnails forming on the sides of the nails. 2. Vitamin deficiency: Vitamins such as vitamin A and B-complex vitamins are essential for healthy skin. Deficiencies in these vitamins may cause dry skin and thinning of the stratum corneum, leading to hangnails. 3. Genetic factors: Some individuals may be genetically predisposed to developing hangnails on the sides of their nails. 4. Exposure to irritants: Frequent contact with detergents or other harsh chemicals may damage the skin around the nails, causing hangnails. 5. Fungal infections: Fungal conditions such as hand ringworm (tinea manuum) may also damage the skin around the nails and lead to hangnails. To address this issue, it is recommended to keep the skin moisturized, ensure adequate vitamin intake, avoid frequent exposure to irritants, and seek medical evaluation and treatment when necessary.