PMC5362858_01
Case 1, ventral aspect of the left hindlimb. The picture was taken after having performed the biopsies
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Swelling, erosions, oozing on the plantar aspect of the digits and a fistula draining a thick and yellowish pus on the distal part of the leg (Figure 1) were observed on the left hindlimb and were less severe on the right forelimb.
(a) Nodular-to-diffuse dermatosis (haematoxylin and eosin [H&E] x 20). (b) Dense dermal infiltrate and pustular lesion (H&E, x 40). (c) Perifollicular and diffuse interstitial cellular infiltrate. Numerous eosinophils are present (H&E, x 100). (d) Close-up view of the cellular infiltrate: numerous eosinophils are present, along with mast cells, plasma cells and lymphocytes (H&E, x 400)
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Plasma cells, histiocytes, lymphocytes and a few foci of eosinophilic furunculosis were also observed (Figure 2a-d).
PMC5362858_02
Case 2, ventral aspect of the right forelimb. Note erythema, oozing and swelling
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Similar lesions to case 1 were observed (Figure 3).
Case 2, follow-up of the left hindlimb. (a) On presentation, note erythema, oozing and swelling. (b) After 1 month, note the diminished swelling, mild erythema, erosions and crusts. (c) After 2 months, there was persistence of swelling on one digit, mild erythema, alopecia and crusts. (d) After 5 months, note the improvement - mild thickening of the digit, mild erythema and hair regrowth
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After 1 month, improvement was observed, with less swelling and oozing (Figure 4a,b). After 3 weeks, further improvement was observed (Figure 4c); however, pilling the cat had become difficult. When lesions were stable, although not completely resolved (Figure 4d), the owner stopped the treatment.