A linear band of erythematous, flat-topped papules on the forearm
Bibliographic record
Abstract
An 8-year-old girl presented with an asymptomatic rash on the left forearm with an abrupt onset that had been present for several months and had never been treated. There was no history of trauma to the involved area. She had atopic dermatitis but was otherwise in excellent health. Her immunizations were all up to date and she did not have any adverse reactions to the vaccinations. On examination, the child was alert and not in distress. There was a linear band of erythematous, flat-topped papules on the left forearm (Figure 1). There were no other cutaneous or systemic abnormalities. The abrupt onset of discrete, erythematous, flat-topped papules, 1 to 3 mm in diameter, in a linear distribution is most characteristic of lichen striatus (1). Lichen striatus is a benign, acquired, asymptomatic, T-cell-mediated dermatosis (1). Typically, the lesions begin abruptly with discrete groups of erythematous, smooth or scaly, flat-topped papules which often coalesce to form a continuous or interrupted linear band over a few weeks. The linear band may develop a curved appearance as it characteristically follows the lines of Blaschko (1). Blaschko’s lines are lines of normal cell development in the skin and they represent pathways of epidermal cell migration and proliferation during fetal development. The band is usually a few mm to 2 cm wide and extends from a few cm to the full length of an extremity (1). Sites of predilection include the extremities, followed by, in decreasing order of frequency, trunk, buttocks, face and neck (1). The lesion usually starts on a proximal extremity and extends distally (1). Typically, the eruption is unilateral and solitary (2). In dark-skinned persons, the lesions may be hypopigmented (lichen striatus albus) (Figure 2) (3). Affected patients are often asymptomatic, although some patients experience pruritus. The differential diagnosis includes lichen planus, linear epidermal nevus, inflammatory linear verrucous epidermal nevus, linear psoriasis, atopic dermatitis, allergic dermatitis, linear Darier’s disease and linear porokeratosis.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.006 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".