Presents with a trypanosomal chancre, a large, painful, indurated skin lesion at the site of the tsetse fly bite, which can have an annular appearance.
Characterized by annular plaques with a slightly raised papular border and a distinct atrophic, wrinkled center, often in sun-exposed areas.
A rare genetic disorder presenting with persistent annular and polycyclic erythematous plaques with a fine, double-edged scale.
A benign condition in infants characterized by transient, recurring, and migrating annular erythematous patches with a fine trailing scale.
Presents as classic violaceous, flat-topped papules that have arranged themselves into a ring-like shape, often with central clearing.
A rare eruption in children and young adults with annular red-brown papules on the groin and trunk, histologically showing a lichenoid pattern.
Psoriatic plaques that have evolved into a ring shape with central clearing and a characteristic silvery-scaled, erythematous border.
Presents as infiltrated, reddish-brown or violaceous papules that form annular plaques, which show a classic "apple-jelly" color on diascopy.
Characterized by keratotic papules arranged in a unique serpiginous (snake-like) or annular pattern that extrude elastic fibers.
A classic hypersensitivity reaction presenting as expanding annular or arcuate erythematous lesions with a characteristic trailing scale on the inner border.
A rare and striking paraneoplastic rash with rapidly migrating, concentric, and swirling erythematous bands that create a unique "wood-grain" appearance.
A specific sign of rheumatic fever, presenting as rapidly spreading, non-pruritic, pink annular macules with a sharp outer edge and pale center on the trunk.
The hallmark of Lyme disease, beginning as a red macule that expands to form a large, annular "bull's-eye" lesion with central clearing.
A genetic disorder with two distinct features: persistent, figurate, red-brown hyperkeratotic plaques and transient, migratory annular erythematous patches.
A drug reaction that characteristically recurs in the exact same location upon re-exposure, often as a solitary, well-demarcated, dusky red or violaceous annular plaque.
Presents as a ring of firm, skin-colored or erythematous papules without any surface scale, typically on the hands and feet.
A benign inflammatory condition presenting as a single or multiple soft, brown-red to violaceous plaques with prominent follicular openings, exclusively on the face.
The initial lesion of pityriasis rosea, appearing as a single, larger, oval, pink-to-red annular patch with a fine collarette of scale, preceding the general eruption.
A feature of Netherton syndrome, characterized by migratory, annular, and polycyclic erythematous patches with a distinctive double-edged scale.
An inflammatory reaction to an insect bite that can form an annular lesion with a central punctum (the bite mark itself).
Presents as linear or annular erythematous plaques, sometimes with a rope-like border, and is often associated with autoimmune diseases.
Characterized by asymptomatic, non-scaly, erythematous papules that coalesce into annular or arcuate plaques on the face, neck, and upper back.
Tuberculoid leprosy classically presents as one or more large, well-defined, anesthetic (loss of sensation), annular plaques with a raised border.
An autoimmune blistering disease that can present as annular or "cluster of jewels" arrangements of tense vesicles and bullae.
A form of cutaneous lupus characterized by succulent, edematous, erythematous, non-scarring plaques without the surface changes (scale, atrophy) of discoid lupus.
A benign B-cell proliferation presenting as a solitary, soft, reddish-brown to violaceous nodule or plaque, often on the earlobe or face.
A form of cutaneous T-cell lymphoma that can present as annular, scaly, erythematous patches or plaques with central atrophy.
Typically on the shins, this condition starts as red-brown papules that expand into a waxy, atrophic, yellowish plaque with a violaceous, raised border and prominent telangiectasias.
A paraneoplastic sign, often of a glucagonoma, featuring migrating annular and irregular erythematous plaques with blistering, crusting, and erosions.
Also known as eosinophilic pustular folliculitis, this presents as coalescing papules and pustules that form annular or serpiginous plaques, primarily on the face.
Following a herald patch, this eruption consists of multiple smaller, oval, pink plaques with a fine collarette of scale, oriented along skin lines in a "Christmas tree" pattern on the back.
A form of pigmented purpura characterized by annular patches of macular cayenne-pepper-like petechiae and telangiectasias, primarily on the lower legs.
Presents as infiltrated, reddish-brown or violaceous papules that form annular plaques, which show a classic "apple-jelly" color on diascopy (pressing with a glass slide).
Also known as subcorneal pustular dermatosis, it is characterized by annular or serpiginous arrangements of flaccid pustules with a unique half-and-half appearance of pus and clear fluid.
A photosensitive form of lupus presenting as annular or polycyclic, erythematous, scaly plaques that are non-scarring and non-atrophic.
Secondary syphilis can present with a wide variety of rashes, including annular, scaly, reddish-brown plaques that are often called the "great imitator".
The classic "ringworm," a fungal infection presenting as an annular, erythematous, scaling patch with a raised, active border and central clearing.
Hives present as transient, edematous, pruritic wheals (welts) that can be annular but are distinguished by their fleeting nature, lasting less than 24 hours.
Presents as urticarial-like wheals that are distinguished by lasting longer than 24 hours, often being painful or burning, and leaving behind purpura or pigmentation.
Also known as eosinophilic cellulitis, this presents as edematous, indurated, erythematous plaques that can be annular and resemble cellulitis or urticaria but are histologically rich in eosinophils.
