Yes, it is s sympton of rosacea. It is common to have enlarged blood vessels on the chest, side of the neck and shoulders. It is usually where the skin is thin and fragile. Most people think it affects only the face.
Hot weather climates can aggravate rosacea by melting the sebum in your pores. Certain parasites
love to feed on this. It can make rosacea MUCH worse. (Try using milk of magnesia on the areas, pat on, allow to dry, rinse of with cool water, This sucks up excess sebum. Leaves the parasites
starving, Also use a dandruff shampoo to kill the parasites.)
Personally I think rosacea is associated with candida and elevated levels of estrogen. As Dusham put it, those issues almost always relate to the liver.
It is important to cleanse for one very good reason, your over all health. Elevated estrogen levels have been intimately associated with all cancers.