Porokeratosis are a group of hereditary or acquired disorders characterized by annular plaques
with an atrophic centre and a hyperkeratotic peripheral ridge.
A 60-year-old female with no significant past medical history presented with a 3-month history of asymptomatic, erythematous, firm, annular plaques
on her bilateral proximal upper extremities and dorsal hands.
Multiple erythematous, squamous, annular plaques
of varying sizes are seen on upper arms and trunk.
Morphologically, the lesions have crusted weeping erosions, vesicles, pustules, expanding annular plaques
with peripheral scaly borders and vegetating plaques with fissures (rhagades).
Granuloma annulare produces slowly expanding annular plaques
that are not itchy and do not scale.
Dermatologic evaluation showed madarosis, thickening of the glabella, and 8 large annular plaques
On examination, the right half of the body was involved in the form of linearly arranged multiple discrete to coalescing hyper keratotic papules and annular plaques
along the blaschko's line, in a nevoid pattern.
Cutaneous examination showed multiple shiny, flat-topped, mildly erythematous, discrete and grouped papular lesions and annular plaques
with central atrophy, varying in size from 2-8 mm in diameter, distributed in a linear fashion on the medial aspect of the left knee, along with an ill-defined, hypopigmented oval patch in the central part on medial aspect of the knee joint (Figure 1).