relationship with the peripheral tissue, topical sensation, elasticity of the skin, hidrotic and sebaceous cond itions or other 3)Commonly Encountered Diseases of Different Positions Different skin positions have their own commonly encountered diseases because of the different anatomy and tissue characters or different environment influence Head There are dermatitis seborrheica, tinea capitis, psoriasis, alopecia or other There are ance, flat wart, dermatitis, seborrheica, freckle, chloasma, lupus vulgaris, rosacea, contact dermatisis, lupus erythematosus, solarius keratoma or other Labial part There are herpes simplex, fixed drug eruption, lichen planus or Tongue There are geographic tongue, ariboflavinosis, lichen planus, cancer or Neck There are neurodermatitis. furuncle scrofuloderma or other Trunk There are tinea versicolor, psoriasis, pityriasis rosea, herpes zoster, urticaria Breast There are intertrigo. eczema. eczematoid carcinoma or other Axillary fossa There are bromidrosis, hidradenitis suppurativa or other Inguinal region There are tinea cruris, intertrigo or other Pudendal region There are eczema, pruritus ani or other Hand and arm There are eczema, erythema multiforme, sporotrichosis, chilblain tinea infection, contact dermatitis, rhagades, pompholyx, scabies, verruca or other Foot and lower limb There are eczema, erythema nodosum, erythema induratum callus. wart. tinea of feet. rhagades or other Physicl Examination 1. Diascopic examination Press the skin lesions with a microslide, if the colour is clear up, they are usually caused by dermohemia and inflammation, if not, they are usually composed of petechia ecchymosises, and pigmentations. When the papules of lupus vulgaris is blanched by diascopic pressure, it will have an apple-jelly"colour 2. Demographic test Draw on the skin by a blunt body to observe whether it appears a dropsical line, which is called dermographia. It can usually be seen in dermatographism, urticaria and urticaria pigmentosa 3. Wood s light examination rrad iate the skin lesions with a high-voltage mercury lamp containing a filter composed of nickel oxide and silicate rock, which can illuminate 360 nm wavelength ultraviolet radiation. They will appear special colours or fluorescence. For example, it will be brill iant green in tinea alba, sap green in favus, red in erythrasma, Ight red or orange in porphyria, vermeil in squamous cell carc inoma, but it will be negative in basal 4. Skin test Patch test This test is used to exam contact anaphylactogen and exam whether the skin is allergic to any chemical substance. It should be carried out in the standard cond itions and observed in 48-72 hours. It can provide the references to the diagnosi Scratch test This test is used to exam whether anaphy lactogens will cause type Irelationship with the peripheral tissue, topical sensation, elasticity of the skin, hidrotic and sebaceous conditions or other. 3) Commonly Encountered Diseases of Different Positions Different skin positions have their own commonly encountered diseases because of the different anatomy and tissue characters or different environment influence. Head There are dermatitis seborrheica, tinea capitis, psoriasis, alopecia or other. Face There are ance, flat wart, dermatisis, seborrheica, freckle, chloasma, lupus vulgaris, rosacea, contact dermatisis, lupus erythematosus, solarius keratoma or other. Labial part There are herpes simplex, fixed drug eruption, lichen planus or other. Tongue There are geographic tongue, ariboflavinosis, lichen planus,cancer or other. Neck There are neurodermatitis, furuncle, scrofuloderma or other. Trunk There are tinea versicolor, psoriasis, pityriasis rosea, herpes zoster, urticaria. Breast There are intertrigo, eczema, eczematoid carcinoma or other. Axillary fossa There are bromidrosis, hidradenitis suppurativa or other. Inguinal region There are tinea cruris, intertrigo or other. Pudendal region There are eczema,pruritus ani or other. Hand and arm There are eczema, erythema multiforme, sporotrichosis, chilblain, tinea infection, contact dermatitis,,rhagades, pompholyx, scabies, verruca or other. Foot and lower limb There are eczema, erythema nodosum, erythema induratum, callus, wart, tinea of feet, rhagades or other. Physicl Examination 1. Diascopic examination Press the skin lesions with a microslide, if the colour is clear up, they are usually caused by dermohemia and inflammation, if not, they are usually composed of petechias, ecchymosises, and pigmentations. When the papules of lupus vulgaris is blanched by diascopic pressure, it will have an “apple-jelly” colour. 2. Dermographic test Draw on the skin by a blunt body to observe whether it appears a dropsical line, which is called dermographia. It can usually be seen in dermatographism, urticaria and urticaria pigmentosa. 3. Wood’ s light examination Irradiate the skin lesions with a high-voltage mercury lamp containing a filter composed of nickel oxide and silicate rock, which can illuminate 360 nm wavelength ultraviolet radiation.. They will appear special colours or fluorescence. For example, it will be brilliant green in tinea alba, sap green in favus, red in erythrasma, lght red or orange in porphyria, vermeil in squamous cell carcinoma, but it will be negative in basal cell carcinoma. 4. Skin test Patch test This test is used to exam contact anaphylactogens and exam whether the skin is allergic to any chemical substance. It should be carried out in the standard conditions and observed in 48~72 hours. It can provide the references to the diagnosis. Scratch test This test is used to exam whether anaphylactogens will cause type Ι