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Fig. 24 

 Urticaria pigmentosa. Skin biopsy section from a case of generalized urticaria pigmentosa, stained 

 Nile blue followed by toluidine blue. Masses of angular mast cells lie in the corium {/ 184). 



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Fig. 25 



Urticaria pigmentosa, another case. Under higher magnification the dermal papilla is seen 



to be filled with well-granulated mast cells. Here the photograph is mounted on its side, 



epidermis to the right. Eosin toluidine blue ( 360). 



