IFM technique is relatively simple to perform, and interpretation of the results is not sophisticated. The proportion of inconclusive results will be decreased if the specimens contain freshly induced blister.

Stevens‐Johnson syndrome (SJS)/toxic epidermal necrolysis (TEN), is a type of delayed hypersensitivity reaction that requires urgent medical intervention. In the COVID‐19 era, COVID‐19 vaccines are currently being widely administered and mucocutaneous adverse reactions following vaccination have been reported; however, severe cutaneous adverse reactions associated with COVID‐19 vaccines including SJS/TEN, are extremely rare. Herein, we describe a case of COVID‐19 vaccination induced TEN which developed 1 day after receiving the first dose of Sinopharm COVID‐19 vaccine with favorable clinical outcome.

Laryngo-onycho-cutaneous (LOC) syndrome is a subtype of autosomal recessive junctional epidermolysis bullosa in which there is prominent skin and mucosal granulation tissue that can lead to delayed wound healing, laryngeal obstruction and blindness. Thus far, all cases are of Punjabi ancestry and have been shown to result from a founder mutation in the LAMA3 gene, notably involving a single nucleotide insertion mutation in exon 39, which is specific to the LAMA3A (designated exon 1 of LAMA3A) and not the LAMA3B1 or LAMA3B2 isoforms. Here, we describe a new pedigree with LOC syndrome. Affected individuals (from Iran) have the characteristic clinicopathological and molecular features of LOC syndrome: prominent granulation tissue (especially affecting the eyes), normal intensity laminin-332 immunostaining at the dermal-epidermal junction, and autosomal recessive mutations in the LAMA3A-specific exon. The pathogenic mutation is a homozygous nonsense mutation, designated p.Gln57X, which just affects the laminin-α3a transcript. These findings therefore expand the molecular basis of LOC syndrome.

Seborrheic keratosis (SK), actinic keratosis (AK), and Bowen's disease (BD) are squamoproliferative disorders of the skin. Histologically, they may mimic each other and therefore, they might be misinterpreted, especially in small samples. The aim of this study is to clarify the expression of p63, p16, and p53 proteins in SK, AK, and BD and evaluate the efficacy of these markers in order to distinguish between the aforementioned lesions. A total of 46 cases were collected (15 SK, 16 AK, and 15 BD) and stained for p63, p16, and p53. The stain intensity and the cell distribution labeling were scored and then analyzed by SPSS software. All cases of BD which became positive for p53 revealed basal keratinocytes sparing. Instead, all or nearly all basal keratinocytes in AK cases were positive for this marker. These were also seen in p16 staining results and they were between AK and BD (P = .024). Our study demonstrates p16 and p53 are useful markers in separating AK and BD according to basal keratinocytes involvement and sparing, respectively.

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Mucous membrane pemphigoid (MMP) is a rare immunobullous disease affecting the mucous membrane and skin. An association of MMP with other autoimmune disease is uncommon. Multiple autoimmune syndrome (MAS) is a subclass of autoimmune disorders with a coexistence of three or more autoimmune disorder in a single patient. The second report of the association of vitiligo, autoimmune thyroid disease, and MMP shows that this combination can be considered as a new type of MAS, although its mechanism and pathology are unknown.

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