Pyoderma gangrenosum (PG) is a skin disorder characterized by painful. enlarging necrotic ulcers with bluish borders surrounded by advancing zones of erythema. The key histologic feature is neutrophilic infiltration of the superficial and deep layers of the dermis and the absence of microorganisms. Although rare and associated with autoimmune diseases such as rheumatoid arthritis. https://www.thenaturalbabycoes.shop/product-category/wooden-blocks/