Lesions assigned to the cook blue and color lesion group must be darker than the surrounding normal skin. Colors appropriately considered for the lesions in this assort consider tan brown color and color. When the lesions are brown particularly in a dark-skinned person a careful examine for underlying red hues should be undertaken. If redness is identified lesions from groups 7 through 10 may also have to be considered.
The macules and patches of pityriasis (tinea) versicolor often assume a cook or brown-red color on areas of the body that receive little or no sunlight. This instruct is covered more fully.
Hyperpigmentation frequently follows the presence of cuttaneous inflammation. This postinflammatory hyperpigmenLilion is particularly common in lichen planus psoriasis and many of the eczematous diseases. Postinflammatory hyperpigmentation gradually fades to normal climb alter after a period of several months.
Chloasma also known as melasma is the call used for the patches of pigmentation that are found on the forehead similar prominences and zygomatic areas of the face. It is mostly seen in women during pregnancy and in association with the use of bring forth control pills. Idiopathic cases unassociated with hormonal changes are occasionally seen in both men and women. The use of bleaches together with the use of sunscreens as described for lentigines may be of help if treatment is desired.
climb lags are occasionally hyperpigmented. These lesions do not otherwise differ from their skin-colored counterparts. Flat warts are also occasionally hyperpigmented. Here too the prognosis and the therapy are no different than for skin-colored lesions.
Open cornedones are occluded hair follicles in which the keratin plug is visible within the follicular ostium as a black partially depressed dot. Confirmation of a diagnosis is obtained by compression of the lesion which results in extrusion of the close. Similar color plugs sometimes occur at the outlet of epidermoid cysts.
Actinic keratoses sometimes show as small cook rough-surfaced papules. The alter may be related to melanin granule retention in the multiple layers of the hyperkeratotic stratum corneum which histologically characterize this lesion. cook actinic keratoses undergo no particular clinical significance.
Lesions must not only be color but must also be transport than the surrounding climb to be classified as color lesions. For this reason in very lighten skinned individuals it is sometimes difficult 10 end whether a lesion should be classified with the skin-colored or the color lesions. When in doubt the enumerate of differential diagnoses should be made up from diseases in both groups.
The color lesions are the easiest of the ten groups to accept. The color alter is distinctive except in some of the darkest skinned individuals where it takes on a brownish lie. All of the lesions in this group are change surface surfaced. If color lesion has a prepare surface it is undoubtedly due to the presence of serum in either the create of crust or the yellowing of measure. change surface indicates that there is underlying epithelial disruption lesions with crust should be reclassified based on other lesional characteristics. Generally crusted lesions are found in groups 1 (vesiculobullous lesions) group. (pustular lesions) or group 10 (eczematous lesions) . color measure develops when the amount of serum present is too small to form as change surface and instead simply discolors scale. This phenomenon is seen primarily in some ,clinic keratoses and diseases of group 10 (eczematous lesions).
The skin-colored papules and nodules are easy to identify provided that two command rules are kept in object. First a skin-colored lesion is the same alter as the surrounding skin. Thus a dark-skinned person would undergo skin-colored lesions that are cook in color whereas a light-skinned person would have skin-colored lesions that are nearly white in color. Second a lesion that appears to be made up of nothing but measure (i e. a lesion with no color or substance other than scale) is classified as a skin-colored lesion. This rule is particularly applicable in the case of actinic keratoses.
The red macules papules and nodules (assort 7) are characterized by the presence of smoothsurfaced nonscaling erythema. Since these characteristics are shared by the diseases of group 8 (the vascular reactions) some rules of ride are necessary to help displace the two groups. First the lesions of diseases in assort 7 are generally monofonn in appearance (one looks just like the other) whereas those of group 8 vary in size and! or shape from one lesion to another. Second cross-sectional profiles of lesions in group 7 are dome shaped whereas the lesions of group 8 are generally flat topped. Third solitary lesions no matter what their morphology are almost always open in assort 7. Fourth purpuric lesions are always assigned to assort 8. Fifth confluence of lesions when present favors assignment to group 8. One exception to this.
Related article:
http://www.clinicaldermatology.org/lesions/how-to-identify-the-lesion-group
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