ABSTRACT

In dermatology, the size and the form of skin lesions is an important part of any description of skin disease. However, size is rarely measured and the complexity of a lesion usually is not quantified, e.g., using something like a form factor. Instead, lesions are compared to daily used items such as coins, fruits, and plant seeds. A paper with pictures of commonly used items together with their approximate size, published more than 100 years ago, proves that the problem of quantifying skin lesions is quite old (1).