Autoimmune Skin Conditions: Psoriasis.

Psoriasis is a chronic, inflammatory skin condition with significant effect on quality of life. It affects 3.2% of the United States population. Psoriasis is caused by an interaction between genetic and environmental triggers. Associated conditions include depression, increased cardiovascular risk, hypertension, hyperlipidemia, diabetes, nonalcoholic fatty liver disease, Crohn disease, ulcerative colitis, celiac disease, nonmelanoma skin cancers, and lymphoma. Several clinical variants exist, including chronic plaque, guttate, pustular, inverse, and erythrodermic psoriasis. Lifestyle modification and topical therapies, such as emollients, coal tar, topical corticosteroids, vitamin D analogues, and calcineurin inhibitors, are used for limited disease. More severe psoriasis may require systemic therapy with oral or biologic therapy. Individualized management of psoriasis may involve different combinations of treatments. Counseling patients about associated comorbidities is essential.

Autoimmune Skin Conditions: Autoimmune Blistering Disease.

There are many types of autoimmune blistering skin disease. Two of the most common are bullous pemphigoid and pemphigus vulgaris. Bullous pemphigoid is characterized by tense bullae created by a subepidermal split resulting from autoantibodies targeted at the hemidesmosomes at the dermal-epidermal junction. Bullous pemphigoid typically occurs in elderly people and often can be drug-induced. Pemphigus vulgaris is characterized by flaccid bullae because of an intraepithelial split triggered by autoantibodies targeting desmosomes. Diagnosis can be made for both conditions by physical examination, biopsy for routine histology, biopsy for direct immunofluorescence, and serologic studies. Both bullous pemphigoid and pemphigus vulgaris are associated with significant morbidity and mortality and diminished quality of life, making early recognition and diagnosis paramount. Management proceeds in a stepwise approach using potent topical corticosteroids along with immunosuppressant drugs. Rituximab recently has been shown to be the drug of choice for most people with pemphigus vulgaris.

Autoimmune Skin Conditions: Cutaneous Lupus Erythematosus.

Cutaneous lupus erythematosus (CLE) is a spectrum of autoimmune skin conditions associated with systemic lupus erythematosus (SLE). CLE and SLE may exist concurrently or independently. Accurate recognition of CLE is crucial because it may herald systemic disease onset. Lupus-specific skin conditions include acute cutaneous lupus erythematosus (ACLE) which manifests as a malar or butterfly rash; subacute cutaneous lupus erythematosus (SCLE); and chronic cutaneous lupus erythematosus, which includes discoid lupus erythematosus (DLE). All three types of CLE present as pink-violet macules or plaques with unique morphology, in areas of sun-exposed skin. Association with SLE differs: ACLE is most closely associated, with SCLE in the middle, and DLE the least so. All types of CLE are pruritic, sting, and burn, and DLE can result in disfiguring scarring. All CLE is exacerbated by UV light exposure and smoking. Diagnosis combines clinical evaluation with skin biopsy. Management focuses on mitigating modifiable risk factors and using pharmacotherapy. UV protection includes use of sun protective factor (SPF) 60 or higher sunscreens containing zinc oxide or titanium dioxide, avoidance of sun exposure, and use of physical barrier clothing. Topical therapies and antimalarial drugs are first-line, followed by systemic therapies (eg, disease-modifying antirheumatic drugs, biologic therapies [eg, anifrolumab, belimumab], or other advanced systemic drugs).

Dermoscopy in Primary Care.

Dermoscopy is a noninvasive technique that allows in vivo magnification of the skin structures and helps in visualizing microscopic features that are imperceptible to the naked eye. Dermoscopy is not a substitute for biopsy and histopathologic evaluation, but is an important tool that can help increase diagnostic sensitivity and specificity of cutaneous lesions. Dermoscopy increases the diagnostic sensitivity compared with naked eye examination. A significant improvement in diagnostic accuracy for benign and malignant lesions has been reported among family medicine physicians after an introductory training course on dermoscopy.