Acneiform eruptions
Acneiform eruptions are caused by changes in the pilosebaceous unit.Acne aestivalis (Mallorca acne)
Acne conglobata
Acne cosmetica (cosmetic acne)
Acne fulminans (acute febrile ulcerative acne)
Acne keloidalis nuchae (acne keloidalis, dermatitis papillaris capillitii, folliculitis keloidalis, folliculitis keloidis nuchae, nuchal keloid acne)
Acne mechanica
Acne medicamentosa
Acne miliaris necrotica (acne varioliformis)
Acne vulgaris (acne simplex)
Acne with facial edema (solid facial edema)
Blepharophyma
Erythrotelangiectatic rosacea (erythematotelangiectatic rosacea, vascular rosacea)
Excoriated acne (acne excoriée des jeunes filles, Pickers acne)
Glandular rosacea
Gnathophyma
Gram-negative rosacea
Granulomatous facial dermatitis
Granulomatous perioral dermatitis
Halogen acne
Hidradenitis suppurativa (acne inversa, pyoderma fistulans significa, Verneuils disease)
Idiopathic facial aseptic granuloma
Infantile acne
Lupoid rosacea (granulomatous rosacea, micropapular tuberculid, rosacea-like tuberculid of Lewandowsky)
Lupus miliaris disseminatus faciei
Metophyma
Neonatal acne (acne infantum, acne neonatorum, neonatal cephalic pustulosis)
Occupational acne
Oil acne
Ocular rosacea (ophthalmic rosacea, ophthalmorosacea)
Otophyma
Periorificial dermatitis
Persistent edema of rosacea (chronic upper facial erythematous edema, Morbihans disease, rosaceous lymphedema)
Phymatous rosacea
Pomade acne
Papulopustular rosacea (inflammatory rosacea)
Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of the scalp, dissecting folliculitis, perifolliculitis capitis abscedens et suffodiens of Hoffman)
Perioral dermatitis
Periorbital dermatitis (periocular dermatitis)
Pyoderma faciale (rosacea fulminans)
Rhinophyma
Rosacea (acne rosacea)
Rosacea conglobata
Synovitis–acne–pustulosis–hyperostosis–osteomyelitis syndrome (SAPHO syndrome)
Steroid rosacea
Tar acne
Tropical acne

Autoinflammatory syndromes
Autoinflammatory syndromes are a group of inherited disorders characterized by bouts of inflammatory skin lesions and periodic fevers. Blau syndrome  
Chronic infantile neurologic cutaneous and articular syndrome
Familial cold urticaria (familial cold autoinflammatory syndrome)
Familial Mediterranean fever
Hyper-IgD syndrome
Majeed syndrome
Muckle–Wells syndrome
TNF receptor associated periodic syndrome (familial Hibernian fever, TRAPS, tumor necrosis factor receptor associated periodic syndrome)

Chronic blistering
Chronic blistering cutaneous conditions have a prolonged course and present with vesicles and bullae.
Acrodermatitis chronica atrophicans (Herxheimer disease, primary diffuse atrophy)
Actinic elastosis (solar elastosis)
Anetoderma (anetoderma maculosa, anetoderma maculosa cutis, atrophia maculosa cutis, macular atrophy)
Blepharochalasis
Cutis laxa (chalazoderma, dermatochalasia, dermatolysis, dermatomegaly, generalized elastolysis, generalized elastorrhexis, pachydermatocele)
Cutis rhomboidalis nuchae
Ehlers–Danlos syndrome (cutis hyperelastica, elastic skin, India rubber skin)
Elastosis perforans serpiginosa
Homocystinuria
Jadassohn–Pellizzari anetoderma
Linear focal elastosis (elastotic striae)
Loeys–Dietz syndrome
Marfan syndrome
Occipital horn syndrome
Osteogenesis imperfecta (Lobstein syndrome)
Perforating calcific elastosis (localized acquired cutaneous pseudoxanthoma elasticum, perforating periumbilical calcific elastosis, periumbilical perforating pseudoxanthoma elasticum)
Pseudoxanthoma elasticum (Grönblad–Strandberg syndrome)
Reactive perforating collagenosis
Schweninger–Buzzi anetoderma
Sclerotic fibroma
Striae atrophicans
Striae distensae
Ullrich disease
Verrucous perforating collagenoma
Wrinkly skin syndrome

Dermal and subcutaneous growths
Dermal and subcutaneous growths result from (1) reactive or neoplastic proliferation of cellular components of the dermis or subcutaneous tissue, or (2) neoplasms invading or aberrantly present in the dermis.