Signs that a cat may be experiencing skin irritation, allergies, or other coat-related health issues include excessive scratching, licking, or biting of the skin, which can lead to hair loss, redness, and scabs. Dandruff, dry or oily skin, and changes in coat texture or appearance, such as dullness or thinning, can also indicate underlying health problems. Cats with skin issues may also display behavior changes, such as restlessness or irritability, due to discomfort. Other symptoms to watch for include red, swollen, or crusty skin lesions, bumps, or rashes, as well as foul odors emanating from the coat or skin. If any of these signs are observed, it is essential to consult with a veterinarian for proper diagnosis and treatment.