The boundary between the dermis and subcutis is blurred

https://books.google.com/books?id=-PsZaBufEM0C&pg=PA92&lpg=P...
ccccccccccccc
Another sonographic finding, i.e. the blurred boundary lines between the dermis and subcutaneous tissue, might be explained by host's response to inflammation or GAG deposition.
https://eje.bioscientifica.com/view/journals/eje/164/4/605.x...
ccccccccccccc

Areas of clinically visible PM and low focal temperature detected by DITI were sonographically characterized with increased skin thickness, hypoechoic substance deposition in the cutaneous tissue, and blurred boundary lines between dermis and subcutaneous tissue.
https://www.ncbi.nlm.nih.gov/pubmed/21266550

ccccc
Tkanka podskórna – wewnętrzna warstwa skóry. Zbudowana jest z tkanki łącznej właściwej luźnej; zawiera również tkankę tłuszczową w ilości zależnej od odżywienia, płci, czynności hormonów i stanu metabolizmu. Tłuszcz zgromadzony pod skórą jest źródłem energii, warstwą izolacyjną oraz chroni przed urazami. Umożliwia częściowe przesuwanie się skóry nad podłożem mięśniowym lub kostnym.
https://pl.wikipedia.org/wiki/Tkanka_podskórna

cccccccccccccc

The subcutaneous tissue (from Latin subcutaneous, meaning 'beneath the skin'), also called the hypodermis, hypoderm (from Greek, meaning 'beneath the skin'), subcutis, or superficial fascia, is the lowermost layer of the integumentary system in vertebrates.[2] The types of cells found in the hypodermis are fibroblasts, adipose cells, and macrophages. The hypodermis is derived from the mesoderm, but unlike the dermis, it is not derived from the dermatome region of the mesoderm. In arthropods, the hypodermis is an epidermal layer of cells that secretes the chitinous cuticle. The term also refers to a layer of cells lying immediately below the epidermis of plants.
https://en.wikipedia.org/wiki/Subcutaneous_tissue