👉 Pythalosis is a condition in which there are many small, dark or yellowish-colored spots on the skin. These spots may be found on the face, neck, chest, back, and even under the fingernails. Pythalosis can be caused by various factors such as sunburn, dermatitis, or infections. Pythalosis can also be a sign of an underlying medical condition, such as psoriasis or eczema. It is important to consult with a healthcare provider if