This chapter includes cutaneous substances that may accumulate in abnormal amounts, such as mucin, as well as material deposits usually not present in the skin, either produced endogenously (e.g., porphyrins) or introduced as a foreign substance (e.g., tattoo pigment). Deposits…
The majority of entities in this chapter can be further classified according to the algorithm in Fig. 109.1 . Open full size image Fig. 109.1 Further classification of benign epidermal proliferations. Although the term solitary lichenoid keratosis is sometimes used,…
Introduction Panniculitis is a diagnostically challenging arena for dermatologists and pathologists. Terminology is difficult, partly because various names have been applied to the same disorder (e.g. nodular vasculitis and erythema induratum), and partly because new discoveries have resulted in the…
This chapter will discuss disorders in which there are increased amounts of collagen within the skin, followed by those with increased elastin. Hypertrophic Scars and Keloids Key features ▪ Conventional scars are preceded by injury, immediate in onset, flat, and…
Key Points The panniculitides comprise a heterogeneous group of inflammatory diseases that involve the subcutaneous fat. Various panniculitides may show the same clinical appearance, consisting of erythematous nodules, which frequently makes histopathologic study necessary in order to obtain the specific…