Mondo Description Sparse hair-short stature-skin anomalies syndrome combines short stature, sparse hair, skin hyperpigmentation and urticaria-like reactions on the hands and arms. An upper central incisor, hypoplastic thumbs and/or palmoplantar hyperkeratosis may also be present. It is thought to be a rare form of ectodermal dysplasia and has been described at least once in a mother and her three sons. Transmission is autosomal dominant, or X-linked.