case_images: PMC11162238_01
case_images: Oedema of the upper and lower lip with hemorrhagic crusts and bleeding easily (A); Multiple irregular ulcer lesions surrounded by erythema areas: Upper labial mucosa (B); Lower labial mucosa (C); Left buccal mucosa (D); Right buccal mucosa (E); Tongue dorsum (F); Right lateral tongue (G); Left lateral tongue (H); Tongue ventral (I); and Floor of the mouth (J).
case_images: IMCRJ-17-573-g0001.jpg
case_images: PMC11162238_01_IMCRJ-17-573-g0001.jpg
case_images: f0001
case_images: The gingiva region of teeth 21-24 showed painless erythema with diffuse borders (Figure 1). 
case_images: Improvement of the oral lesion on the twelfth day: Lips (A); Upper labial mucosa (B); Lower labial mucosa (C); Left buccal mucosa (D); Right buccal mucosa (E); Tongue dorsum (F); Right lateral tongue (G); Left lateral tongue (H); Tongue ventral (I); and Floor of the mouth (J).
case_images: IMCRJ-17-573-g0002.jpg
case_images: PMC11162238_01_IMCRJ-17-573-g0002.jpg
case_images: f0002
case_images: Improvement of lesions in the lips and oral cavity were shown in Figure 2. 