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See Fig. 5.174 A&B. Figure 5.174 A&B. Nodular dermatitis and diffuse dermatitis. Nodular dermatitis is distinguished from perivascular dermatitis (see Fig. 5.16 A&B) by the density of the infiltrate of inflammatory cells. In the perivascular dermatitides, the infiltrates can be described roughly as being sparse to moderately dense, whereas in nodular dermatitides the infiltrates are […]