Testosterone is a male hormone and has no influence in the development of breasts (mammary glands), estrogen the female hormone does,
Estrogen is the primary hormone that stimulates the development of the mammary gland. It promotes the growth of breast tissue and ducts, preparing the gland for potential milk production during pregnancy and lactation.
The hormone primarily responsible for the growth of mammary gland ducts during pregnancy is estrogen.
Mammary gland
Mammary gland
Mammary glands are the source of milk production in female (and some male) mammals
mammary alveolus
Mammals have mammary glands like whales
Do you mean, "Where is lymph from mammary glands collected?" Most of the lymph in a human mammary gland travels, ultimately, to the apical axillary lymph nodes.
The mammary gland is an exocrine gland. It has ducts through which milk is secreted.
mammary glands produce milk in a females body
The breast.