Neonatal acne most commonly occurs at this age.
What is 2-4 weeks?
This blue-black macule is found over the lumbosacral area in 90% of Native-American, African-American, and Asian descent and histologically consists of spindle-shaped pigment cells suspended deep in the dermis.
What is dermal melanocytosis?
(AKA "Mongolian spot")
This disorder is characterized by honey-colored crusts and is treated with topical antibiotics effective against Staphylococcus aureus.
What is impetigo?
Thickened, broken-off hairs with erythema and scaling of the underlying scalp are the distinguishing features of this fungal infection which leaves a "black dot" appearance.
What is tinea capitis?
Painful, grouped vesicles or erosions on a red base suggest this infection.
What is herpes simplex?
The presence of excoriated papules and pustules with a history of severe itching at night suggest infestation with this.
What is the human body louse?
This form of dermatitis is characterized by symmetrically distributed coin-shaped patches principally on the extremities.
What is nummular eczema?
What is pityriasis rosea?
This disorder, also known as IgA vasculitis, causes the small blood vessels in your skin, joints, intestines, and kidneys to become inflamed and bleed.
What is Henoch-Schonlein purpura?
This is the primary event in acne formation.
What is obstruction of the sebaceous follicle?
This light brown oval shaped lesion may be found anywhere on the body, but the presence of 6 or more over 1.5 cm in diameter is a major diagnostic criterion for neurofibromatosis type 1.
What is a cafe au lait macule?
Histologically, this disorder represents invasion of microorganisms into the lower dermis and sometimes beyond, with obstruction of local lymphatics with group A beta-hemolytic streptococci and coagulase-positive staphylococci being the most common causes.
What is cellulitis?
The diagnosis of tinea corporis is made using this technique.
What is scraping thin scales from the border of the lesion, dissolving them in 20% KOH, and examining for hyphae?
Grouped vesicles limited to a dermatome is most characteristic of this infection.
What is Varicella-Zoster?
This parasite leaves linear burrows about the wrists, ankles, finger webs, genitalia, and axillary folds.
What are scabies?
The most common type of primary irritant contact dermatitis is this, developing within a few hours, reaching peak severity at 24 hours, then disappearing.
What is diaper dermatitis?
Topical steroids are the initial treatment of choice for these erythematous papules and plaques covered by thick white scales most often on the knees, elbows, and scalp.
What is psoriasis?
This facial rash on the face is characterized as a butterfly pattern and spares the nasolabial folds.
What is systemic lupus erythematosus?
This is the prominent clinical lesion in early adolescent acne and is often referred to as a black head.
What is an open comedone?
This reddish-brown smooth solitary papule appears on the face or extremities and histologically consists of epithelioid and spindle-shaped nevomelanocytes that may demonstrate nuclear pleomorphism; they are benign in most cases.
What is a Spitz nevus?
A pustule at a follicular opening represents folliculitis but deeper infections of multiple follicles is called this.
What are carbuncles?
(singular follicular deep infections are called furuncles)
This is the first sign of onychomycosis, or tinea unguium.
What is loosening of the nail plate from the nail bed giving a yellow discoloration?
This pox virus induces the epidermis to proliferate, forming a pale papule that is flesh-colored and umbilicated.
What is molluscum contagiosum?
This is the treatment of choice for scabies.
What is permethrin 5% as a single overnight application and repeated in 7 days for both the patient and household contacts.
This is the treatment of choice for allergic contact dermatitis.
What are topical steroids?
This complete hair loss in a localized area is the most common cause of hair loss in children.
What is alopecia areata?
This skin condition refers to a group of hypersensitivity disorders characterized by symmetric red, patchy lesions, primarily on the arms and legs; it is associated with herpes simplex virus and in half of the cases, the triggering agents appear to be medications.
What is erythema multiforme?
This is the most effective treatment for severe cystic acne.
What is isotretinoin?
This red, rubbery vascular plaque or nodule undergoes a rapid growth phase, stabilizes by 9-12 months, then slowly involutes over the next several years with 90% reaching maximal regression by age 9.
What is a hemangioma?
Ecthyma is a firm, dry crust, surrounded by erythema that exudes purulent material and represents invasion by this bacteria through the epidermis to the superficial dermis.
What is group A beta-hemolytic streptococci?
This cause of diaper dermatitis is treated with a topical imidazole cream applied twice a day.
What is Candida albicans?
Human papillomavirus cause these rough, skin-colored papules.
What are warts?
Pyrethrin or permethrin products are the initial treatment of choice for this infestation.
What is head lice?
This common condition occurs predominantly in the newborn and at puberty, the ages at which hormonal stimulation of sebum production is maximal.
What is seborrheic dermatitis?
This type of erythema involves pink rings, is found primarily on the torso and extensor surfaces, and come and go for as long as several months.
What is erythema marginatum?
This rare, serious disorder of the skin and mucous membranes is usually a reaction to medication that starts with flu-like symptoms, followed by a painful rash that spreads and blisters; the top layer of affected skin dies, sheds and begins to heal after several days.
What is Stevens-Johnson syndrome?
This is the first-line treatment for both comedonal and inflammatory acne.
What are topical retinoids?
Occurring in 1 in 20,000 infants, congenital nevi are considered to be "giant" when they cover this percentage of body surface area.
What is 5%?
This treatment alone is adequate for uncomplicated MRSA skin abscesses in otherwise healthy patients.
What is incision and drainage?
(extensive cases require adjuvant systemic antibiotics)
Tinea versicolor is a superficial infection, caused by this yeast-like fungus, which causes polycyclic connected hypopigmented macules and very fine scales in areas of sun-induced pigmentation, and is treated with selenium sulfide.
What is Malassezia globosa?
The average time of onset of skin lesions after perinatally acquired HIV infection is this.
What is 4 months?
(it is 11 months after transfusion-acquired infection)
These delayed hypersensitivity reactions to stinging or biting insects are not true infestations.
What is papular urticaria?
Low-potency topical corticosteroids may help decrease any inflammatory component of this white, scaly, macular dermatitis with indistinct borders commonly seen over extensor surfaces of extremities and on the cheeks of children.
What is pityriasis alba?
This skin disorder is characterized by tender, red bumps, usually found symmetrically on the shins, and up to 55% of cases have no clear identifiable cause.
What is erythema nodosum?
This condition results from the release of histamine, bradykinin, leukotriene C4, prostaglandin D2, and other vasoactive substances from mast cells and basophils in the dermis.
What is urticaria?