: 710 Mucosal sarcoidosis is a cutaneous condition characterized by pinhead-sized papules that may be grouped and fused together to form a flat plaque. : 711 Erythrodermic sarcoidosis is a cutaneous condition and very rare form of sarcoidosis. : 710

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== External links ==
Biochemistry
The overall reaction is

4 Fe2+ – cytochrome c + 4 H+ + O2 → 4 Fe3+ – cytochrome c + 2 H2O                ΔfGo = - 218 kJ/molTwo electrons are passed from two cytochrome cs, through the CuA and cytochrome a sites to the cytochrome a3–CuB binuclear center, reducing the metals to the Fe2+ form and Cu+. The hydroxide ligand is protonated and lost as water, creating a void between the metals that is filled by O2. The oxygen is rapidly reduced, with two electrons coming from the Fe2+-cytochrome a3, which is converted to the ferryl oxo form (Fe4+=O). The oxygen atom close to CuB picks up one electron from Cu+, and a second electron and a proton from the hydroxyl of Tyr(244), which becomes a tyrosyl radical. The second oxygen is converted to a hydroxide ion by picking up two electrons and a proton. A third electron from another cytochrome c is passed through the first two electron carriers to the cytochrome a3–CuB binuclear center, and this electron and two protons convert the tyrosyl radical back to Tyr, and the hydroxide bound to CuB2+ to a water molecule.