Hyperpigmentation of the skin Pretibial plaque 2022-12-21T12:34:00Z Pretibial plaques occur in a specific pattern with hyperpigmentation, atrophy or induration and scarring of the lower limbs typically over the pretibial area. Hyperpigmentation appears to develop gradually from mild, brownish hyperpigmented patches clinically in keeping with haemosiderin deposition, to indurated or atrophic plaques and can progress to cover the entire circumference of the calf. Plaques are often associated with skin fragility, whether atrophic or indurated. They are thought to be a result of extensive bruising and confluent atrophic scars because of the increased fragility of dermis and small blood vessels. Pretibial plaques Pretibial plaques are strongly associated with periodontal-type Ehlers-Danlos syndrome. See Figure 1 of PMID:24198978. Pretibial hyperpigmentation