It is more common in young and middle-aged people; it usually occurs on the side of the neck, the back of the neck, and the upper eyelids. It is usually limited to one place or distributed symmetrically on both sides. It initially appears as local paroxysmal itching, which is aggravated by local skin irritation or mental distress.

After scratching/rubbing, clusters of miliary to rice-sized polygonal flat papules with skin color/light red/light brown appear, which are diamond-shaped.

Polygonal mosaic appearance, the texture is relatively solid and shiny, and the surface is covered with bran-like thin scales.

Over time, the papules may merge and expand, becoming dark brown in color, with increased skin ridges, deepened and intertwined skin lines, resembling leather-like patches, with dry, rough, and hypertrophic surfaces (lichenification); the diameter of the lesions can reach 2 to 6 mm. The central damage is large and obvious, with smaller flat papules appearing on the edge, and the boundary is very clear

More common in adults and the elderly; skin lesions are widespread

Most of them show lichen-like changes, and scratches/blood scabs can be seen in the affected area and surrounding areas; conscious paroxysmal itching, mild in summer and winter, and the course of the disease is chronic, often lasting for a long time.

Find and remove various factors that may induce itching, provide patient and targeted psychological treatment, and try to avoid all forms of scratching, friction and irritation; avoid washing in hot water and abusing irritating topical drugs

Creams/tinctures/ointments containing antipruritic ingredients and corticosteroids; for those with obvious lichenification, strong corticosteroid ointment can be used for encapsulation or for local application of Fukining plaster; for those with thickened and small-scale skin lesions, corticosteroid injection therapy can be used

Use antihistamines with sedative effects (such as cyproheptadine, ketotifen), combined with vitamin B; for those who cannot control, take diazepam drugs; in severe cases, procaine vein closure can be used

①Increase of androgens and sebum;

② Hyperkeratosis at the opening of the pilosebaceous gland;

③ Propionibacterium acnes infection;

④ Secondary inflammatory reaction

acne vulgaris

special type

1. Rosacea: It is more common in middle-aged people, and is more likely to occur on the tip of the nose, cheeks, forehead and chin; the affected areas may have telangiectasia, papules, pustules, and rhinophyma will form in the later stage.

2. Facial disseminated miliary lupus: more common in adults; manifests as dark red papules/nodules, soft to touch, and necrotic in the center; yellow/brown dots may appear when the slide is pressed, symmetrically distributed in Eyelids, nasolabial folds and cheeks

General treatment

topical medications

Systemic drugs

other

Features

installment

1. Pseudoalopecia areata: multiple atrophic patches on the scalp; the outbreak area is clearly defined but has irregular edges.

2. Tinea capitis: incomplete hair loss, the hair is easily broken, with scales/scab attached, and fungi can be found in the broken hair.

①Remove possible inducements;

②Topical drugs (such as minoxidil, capsicum tincture);

③ Systemic drugs (such as cystine, calcium pantothenate, vitamin B; glucocorticoids can be used if the disease develops rapidly and extensively)

①General treatment;

②5α-reductase inhibitor (finasteride);

③Topical drugs (such as minoxidil);

④ Hair transplantation

Basic performance

Types

1. Pityriasis simplex: more common in children; localized hypopigmented spots (rather than depigmented spots) on the face, the boundaries of the lesions are unclear, and there may be small scurfs on the surface

2. Tinea versicolor: It is seen on the cheeks and between the eyebrows of infants and young children. It is light yellow in color; however, due to frequent scrubbing, the scales are rare and can easily be confused with early vitiligo.

3. Anemic nevus: friction test - after friction, the skin around the white spot is congested but the white spot area remains pale.

4. Achromatic nevus: There are localized light-colored spots at birth/shortly after birth, with unclear boundaries, and the damage is often distributed along nerve segments.

5. Post-inflammatory hypopigmentation: There is a history of primary disease; hypopigmentation is limited to the original skin lesion; it is temporary and can recover on its own

① Phototherapy: psoralen phototherapy; long-wave ultraviolet irradiation can be added for generalized hair problems all over the body;

② Nitrogen mustard ethanol;

③Autologous epidermal transplantation: suitable for when the lesions are small and the condition is stable;

④Glucocorticoids: suitable for generalized and progressive disease;

⑤Topical immunosuppressants: such as tacrolimus

①Treat the cause;

② Local treatment: depigmenting agent (such as 3% hydroquinone cream, 3% hydrogen peroxide), 20% azelaic acid cream, 25% trichloroacetic acid, SOD cream;

③Chinese herbal medicine: Liuwei Dihuang Pills, Xiaoyao Pills, etc.