Atopic dermatitis (AD) is a highly pruritic, chronic inflammatory skin disease. The diagnosis is made using evaluated clinical criteria. Disease activity and burden are best measured with a composite score, assessing both objective and subjective symptoms, such as SCORing Atopic Dermatitis (SCORAD). AD management must take into account clinical and pathogenic variabilities, the patient’s age and also target flare prevention. Basic therapy includes hydrating and barrier‐stabilizing topical treatment universally applied, as well as avoiding specific and unspecific provocation factors. Visible skin lesions are treated with anti‐inflammatory topical agents such as corticosteroids and calcineurin inhibitors (tacrolimus and pimecrolimus), which are preferred in sensitive locations. Topical tacrolimus and some mid‐potency corticosteroids are proven agents for proactive therapy, which is defined as the long‐term intermittent anti‐inflammatory therapy of frequently relapsing skin areas. Systemic anti‐inflammatory or immunosuppressive treatment is a rapidly changing field requiring monitoring. Oral corticosteroids have a largely unfavourable benefit–risk ratio. The IL‐4R‐blocker dupilumab is a safe, effective and licensed, but expensive, treatment option with potential ocular side‐effects. Other biologicals targeting key pathways in the atopic immune response, as well as different Janus kinase inhibitors, are among emerging treatment options. Dysbalanced microbial colonization and infection may induce disease exacerbation and can justify additional antimicrobial treatment. Systemic antihistamines (H1R‐blockers) only have limited effects on AD‐related itch and eczema lesions. Adjuvant therapy includes UV irradiation, preferably narrowband UVB or UVA1. Coal tar may be useful for atopic hand and foot eczema. Dietary recommendations should be patient‐specific, and elimination diets should only be advised in case of proven food allergy. Allergen‐specific immunotherapy to aeroallergens may be useful in selected cases. Psychosomatic counselling is recommended to address stress‐induced exacerbations. Efficacy‐proven 'Eczema school' educational programmes and therapeutic patient education are recommended for both children and adults.

In the autoimmune disease lupus, platelets activated by self-antigens contribute to pathology by triggering the secretion of interferon from immune cells.

The term ‘sclerosing diseases of the skin' comprises specific dermatological entities, which have fibrotic changes of the skin in common. These diseases mostly manifest in different clinical subtypes according to cutaneous and extracutaneous involvement and can sometimes be difficult to distinguish from each other. The present guideline focuses on characteristic clinical and histopathological features, diagnostic scores and the serum autoantibodies most useful for differential diagnosis. In addition, current strategies in the first‐ and advanced‐line therapy of sclerosing skin diseases are addressed in detail. Part 1 of this guideline provides clinicians with an overview of the diagnosis and treatment of localized scleroderma (morphea), and systemic sclerosis including overlap syndromes of systemic sclerosis with diseases of the rheumatological spectrum.