A prolactinoma is a benign tumor (adenoma) of the pituitary gland that produces the hormone prolactin. It is the most common type of functioning pituitary tumor. Symptoms of prolactinoma are due to abnormally high levels of prolactin in the blood (hyperprolactinemia), or due to pressure of the tumor on surrounding tissues. Based on size, a prolactinoma can be classified as a microprolactinoma (<10 mm diameter) or a macroprolactinoma (>10 mm diameter). Signs and symptoms
The symptoms due to a prolactinoma are broadly divided into those that are caused by increased prolactin levels or mass effect. Those that are caused by increased prolactin levels are:
Amenorrhea (disappearance of ovulation periods)
Galactorrhea (Milk production; infrequent in men)
Loss of axillary and pubic hair
Hypogonadism (Reduced function of the gonads.) Gynecomastia (an increase in male breast size)
Erectile dysfunction (in males)Those that are caused by mass effect are:

Headaches
Vision Changes-visual field deficits, blurred vision, decreased visual acuity
Cranial nerve palsies-especially with invasive tumors or with pituitary apoplexy
Seizures, Hydrocephalus, Unilateral exophthalmos are rare presentations
Hypopituitarism
Pituitary apoplexy is a medical emergency because of spontaneous hemorrhage into the pituitary tumor and presents with severe headaches, vision changes, and acute panhypopituitarism. Causes
The cause of pituitary tumors remains unknown. Though most pituitary tumors are sporadic, some genetic syndromes include increased risk for pituitary adenomas including Multiple endocrine neoplasia type 1 (caused by a mutation in the MEN1 gene) and Familial isolated pituitary adenoma (FIPA). The majority of moderately raised prolactin levels (up to 5000 mIU/L) are not due to microprolactinomas but other causes.
Liver spots (also known as age spot, solar lentigo, "lentigo senilis",: 686  "old age spot", "senile freckle") are blemishes on the skin associated with aging and exposure to ultraviolet radiation from the sun. They range in color from light brown to red or black and are located in areas most often exposed to the sun, particularly the hands, face, shoulders, arms and forehead, and the scalp if bald. The spots derive their name from the fact that they were once incorrectly believed to be caused by liver problems, but they are physiologically unrelated to the liver, save for a similar color. From the age of 40, the skin is less able to regenerate from sun exposure, and liver spots are very common in this age group, particularly in those who spend time in the sun.In the overwhelming majority of cases, liver spots pose no threat and require no treatment, though they occasionally have been known to obscure the detection of skin cancer. However, despite being a benign condition, liver spots are sometimes considered unsightly and some people choose to have them removed. This can be done by electrosurgery, laser treatment, cryotherapy, or the use of depigmentation agents, such as hydroquinone,  tretinoin, topical cysteamine, azelaic acid, or alpha hydroxy acids. Causes
Differently from the melanotic nevi and the verrucous nevi on the skin, age spots change in color and in shape with time. Michelitsch and Michelitsch propose a hypothesis inspired by their misrepair-accumulation aging theory for the development of age spots.