: 24

Colloid milium
Colloid milium is a skin condition characterized by a translucent, flesh-colored, or slightly yellow, 1 to 5 mm papules. : 31

Pathophysiology
Miliaria occurs when the sweat gland ducts get clogged due to dead skin cells or bacteria such as Staphylococcus epidermidis, a common bacterium that occurs on the skin, which is also associated with acne. The trapped sweat leads to irritation (prickling), itching, and a rash of very small blisters, usually in a localized area of the skin. Prevention
Prickly heat can be prevented by avoiding activities that induce sweating, using air conditioning to cool the environment, wearing light clothing, and in general, avoiding hot and humid weather. Frequent cool showers or cool baths with mild soap can help to prevent heat rash. Treatment
The primary remedy for prickly heat or rash is to wear lighter clothing, or otherwise avoid overheating ones body. The immediate treatment of the involved skin areas involves the use of a soothing ointment such as calamine lotion. Talcum powder may be used in some cases. Medical assistance should be sought for the first episode of a rash with the appearance of miliaria. The differential diagnosis includes several conditions that an experienced practitioner should be able to recognise and may require treatment distinct from the usual measures taken for miliaria. In most cases, the rash of miliaria resolves without intervention, but  severe cases can last for weeks and cause significant disability.
Miliaria profunda
The most severe form of miliaria, miliaria profunda, sometimes referred to as "wildfire" due to the rapid spread and severe burning sensations, generally occurs as a complication of repeated episodes of miliaria rubra. The obstruction is deep in the structure of the sweat gland, causing the glands secretions to leak between the superficial and deep layers of the skin. The rash and associated symptoms tend to appear within hours of an activity provoking sweating, but similarly fade within hours when the stimulus for the sweating is removed. Miliaria profunda is characterised by nonpruritic, flesh-coloured, deep-seated, whitish papules. : 24  The rash tends to be flesh-coloured as opposed to the prominent redness of miliaria rubra, and the risk of heat exhaustion is larger. Miliaria profunda is also less commonly known as "mammillaria": chapter 40

Miliaria pustulosa
Miliaria pustulosa describes pustules due to inflammation and bacterial infection. Miliaria pustulosa is preceded by another dermatitis that has produced injury, destruction, or blocking of the sweat ducts. : 23

Postmiliarial hypohidrosis
Postmiliarial hypohidrosis is a skin condition that results from occlusion of sweat ducts and pores, and may be severe enough to impair an individuals ability to perform sustained work in a hot environment. : 24

Tropical anhidrotic asthenia
Tropical anhidrotic asthenia is a skin condition, a rare form of miliaria, with long-lasting poral occlusion, which produces anhidrosis and heat retention. : 24

Occlusion miliaria
Occlusion miliaria is a skin condition that is accompanied by anhidrosis and increased heat-stress susceptibility, all after the application of extensive polyethylene film occlusion for 48 hours or longer.