17) Dermatographia
Dermatographia, a rare skin condition, is characterized by unexplained patterns of blisters, rashes, and other skin lesions. The term dermatographia is derived from dermatology and graphology, the study of handwriting. It is often mistaken for stigmata or maculopapular erythema, but unlike stigmata, dermatographia is not associated with religious imagery; rather, it is an abnormal pattern of skin damage. Individuals with dermatographia may experience unexpected blisters or rashes on their skin for no apparent reason, which can be itchy or painful. While anyone can develop dermatographia, it is most common in children aged 5 to 15 years. The cause of dermatographia is not fully understood, with some attributing it to genetics and others linking it to poor nutrition or environmental factors such as pesticides and air pollution. In some cases, individuals with dermatographia may have a higher risk of developing eczema or psoriasis. Currently, there is no cure for dermatographia, but doctors can alleviate symptoms such as itching and discomfort by applying ointments to the affected area.