The 4 Dermatology Lesions Every FNP Student Must Recognize for Boards

Dermatology · 3 min read · November 11, 2026

Introduction to High-Yield Dermatology on FNP Boards

Dermatology questions on the AANP and ANCC board exams can feel overwhelming because of the sheer volume of rashes and lesions you are expected to memorize. However, the exam makers love patterns. If you focus on the classic presentation, key buzzwords, and first-line treatments, dermatology can easily become your highest-scoring section. Let us break down four high-yield dermatological concepts that frequently appear on your exam.

Actinic Keratosis vs. Squamous Cell Carcinoma

Actinic keratosis (AK) is the most common pre-malignant skin lesion caused by cumulative sun exposure. On physical exam, AKs are classically described as rough, scaly papules or plaques on sun-exposed areas like the face, scalp, and dorsal hands. Patients often say they feel these lesions before they see them—describing a texture like sandpaper.

Board Pearl: Actinic keratosis is a precursor to squamous cell carcinoma (SCC). If an AK thickens, develops a cutaneous horn, or ulcerates, suspect malignant transformation to SCC.
Treatment: First-line localized treatment for AK is cryotherapy (liquid nitrogen). If the patient has multiple widespread lesions, topical 5-fluorouracil (5-FU) cream or imiquimod is commonly prescribed.

Pityriasis Rosea and the Herald Patch

Pityriasis rosea is a benign, self-limiting inflammatory skin condition typically seen in teenagers and young adults. The hallmark sign is the appearance of a herald patch—a single, 2-to-5 cm oval plaque with central clearing and a collarette of scale—which appears 1 to 2 weeks before a generalized eruption.

Board Pearl: Following the herald patch, a secondary eruption appears along the Langer lines of the trunk, creating the classic "Christmas tree" distribution.
Treatment: Pityriasis rosea is self-limiting and typically resolves spontaneously within 6 to 8 weeks. Management is purely symptomatic. Reassure your patient, and use emollients, topical steroids, or oral antihistamines for pruritus.

Atopic Dermatitis and the Itch-Scratch Cycle

Atopic dermatitis, commonly known as eczema, is a chronic, pruritic inflammatory skin disease strongly associated with a personal or family history of atopy (asthma, allergic rhinitis). The distribution changes by age: in infants, it typically affects the face and extensor surfaces; in older children and adults, it favors the flexural creases (antecubital and popliteal fossae).

Board Pearl: The hallmark feature of atopic dermatitis is intense pruritus leading to lichenification (thickening of the skin from chronic scratching). Always assess for secondary bacterial infections like impetigo if honey-colored crusts appear.
Treatment: First-line management centers on aggressive skin hydration with thick emollients and low-to-medium potency topical corticosteroids for acute flares. Calcineurin inhibitors are useful second-line agents for sensitive areas like the face.

Impetigo and Honey-Colored Crusts

Impetigo is a highly contagious superficial bacterial skin infection most commonly caused by Staphylococcus aureus or Streptococcus pyogenes. It typically presents around the nose and mouth as fragile vesicles that rupture easily, leaving behind characteristic honey-colored crusts.

Board Pearl: Do not confuse the presentation with herpes simplex virus; impetigo crusts are uniquely honey-colored and weeping. Bullous impetigo, caused by S. aureus, features larger fluid-filled blisters.
Treatment: For localized lesions, prescribe topical mupirocin (Bactroban) ointment. For widespread or multiple lesions, oral antibiotics targeting staph and strep (such as cephalexin or dicloxacillin) are required.

You have got this! Board preparation is a marathon, but mastering core clinical patterns one step at a time will build the confidence you need to walk into that testing center and pass on your first attempt.